... Access Replicative phenotyping adds value to genotypic resistance testing in heavily pre-treated HIV- infected individuals - the Swiss HIV Cohort StudyJan Fehr1†, Tracy R Glass2†, Séverine Louvel3,4, ... Chemother 2006, 50:69 4-7 01.doi:10.1186/147 9-5 87 6-9 -1 4Cite this article as: Fehr et al.: Replicative phenotyping adds value to genotypic resistance testing in heavily pre-treated HIV- infected individuals ... mixed findings, either resulting in non-significant gains [1 9-2 1] or in only a small bene-fit [25] and cost savings [2 2-2 4] from GRT-guided ther-apy adjustment. Moreover, several clinical trials...